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Atomic Spectra:

passing an electric current through a gas in a neon tube energizes the electrons of the atoms of the gas, and causes them to omit light.
when atoms absorb energy electrons move ino higher energy levels and these electrons lose energy by emitting light when they return to lower energy levels.
each specific frequency of visible light emitted corresponds to a particular color.
when the light passes the frequencies of light emitted by an element seperate into discrete lines to give the atomic emission spectrum by the element.
each discrete line in an emission spectrum corresponds to one exact frequency of light emitted by the atom.
no two elements have the same emission spectrum.

An Explanation of Atomic Spectra:

In the Bohr model the lone electron in the hydrogen can have only specific energies.
the lowest possible energy is called ground state.
in the ground state the electrons principal quantum number is 1.
the light emitted from an electron moving from a higher to a lower energy level has a frequency directly proportional to energy change of the electron.
lyman series are the lines at the UV end of the hydrogen spectrum. n=1
the lines in the visible spectrum are the Balmer series. n=2
paschen series are the transition from n=2 to n=3.
n=4 and n=5 exists too.
the quantum mechanical model is based on the description of the motion of material objects as waves.

The Atom